On 26 August 2015, contact was lost with an ATR 42-300 making a descent to Oksibil supposedly using detailed Company-provided visual approach guidance over mountainous terrain. Its burnt out wreckage was subsequently located 10 nm from the airport at 4,300 feet aal. The Investigation found that the prescribed guidance had not been followed and that the Captain had been in the habit of disabling the EGPWS to prelude nuisance activations. It was concluded that a number of safety issues identified collectively indicated that the organisational oversight of the aircraft operator by the regulator was ineffective.